<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container >
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu background-color="#313743" text-color="#fff"
          active-text-color="#369BFF" unique-opened router
          :collapse="isCollapse" :collapse-transition="false"
          :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" 
            :key="subItem.id" @click="saveNavState('/'+subItem.path)">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧主题内容 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data(){
    return {
      //左侧菜单数据
      menulist:[],
      iconsObj:{
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      //是否折叠
      isCollapse:false,
      //被激活的连接地址
      activePath:''
    }
  },
  created() {
    this.getMenuList(),
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      //清空token
      window.sessionStorage.clear()
      //跳转到登录页
      this.$router.push('/login')
    },
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      //console.log(res)
    },
      //点击按钮，菜单切换折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    //保存连接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  height: 6vh !important;
  background: #363d40;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: 0;
  color: #fff;
  font-size: 20px;
  div {
    display: flex;
    align-items: center;
    img{
      width: 5vh;
      height: 5vh
    };
    span {
      margin-left: 15px;
    }
  };
  .el-button{
    height: 5vh;
  }
}
.el-aside {
  background: #313743;
  .el-menu{
    border-right: none;
  }
}

.el-main {
  background: #e9edf1;
  height: 94vh;
  padding: 1vh;
}
.iconfont{
  margin-right: 10px;
}
.toggle-button{
  background:#475163;
  text-align: center;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>